"AV1 is a new general-purpose video codec developed by the
Alliance for Open Media. The alliance began development of
this new codec using Google's VPX codecs, Cisco's Thor
codec, and Mozilla's/Xiph.Org's Daala codec as starting
point. AV1 leapfrogs the performance of VP9 and HEVC,
making it a next-next-generation codec. The AV1 format is and
will always be royalty-free with a permissive FOSS
license."